Photo of Delhi Durbar 1903

The Delhi Durbar meaning "Court of Delhi", was a mass assembly at Coronation Park, Delhi, India, to mark the succession of an Emperor or Empress of India. Also known as the Imperial Durbar, it was held three times, in 1877, 1903, and 1911, at the height of the British Empire. The 1911 Durbar was the only one attended by the sovereign, who was George V. The term was derived from common Mughal term durbar.

Jantar Mantar, 1858

The Jantar Mantar is located in the modern city of New Delhi. It consists of 13 architectural astronomy instruments. The site is one of five built by Maharaja Jai Singh II of Jaipur, from 1723 onwards, as he was given by Mughal emperor Muhammad Shah the task of revising the calendar and astronomical tables. There is a plaque fixed on one of the structures in the Jantar Mantar observatory in New Delhi that was placed there in 1910 mistakenly dating the construction of the complex to the year 1710. Later research, though, suggests 1724 as the actual year of construction.The primary purpose of the observatory was to compile astronomical tables, and to predict the times and movements of the sun, moon and planets. Some of these purposes nowadays would be classified as astronomy.Completed in 1724, the Delhi Jantar Mantar had decayed considerably by 1867.